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What will happen with the depletion region width W and the built-in voltage Vbi of a p-n junction if we increase the acceptor concentration Na of the p-type region from 1E+16 to 1E+18, while the donor concentration in the n-type region remains 1E+15 ?
(1) The depletion width will increase and the built-in voltage will decrease.
(2) Both the depletion width and the built-in voltage will decrease.
(3) The depletion width will decrease and the built-in voltage will increase.
(4) Both the depletion width and the built-in voltage will increase.
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